You should be familiar by now with the story of Francesco Bulto, who left Montessa in the late 1950’s and soon later formed Bultaco. One of Bultaco’s most successful models, especially in the US, was the Pursang.
The Pursang was available in several engine sizes, including 125, 250, 360 and 370cc's. This particular bike is a restored 1975 model 250. The 250 was a single-cyclinder 2-stroke, 5 speed that put out approximately 35 hp. At 220 pounds, it was a formidable motocross weapon, and was very successful in both American and international competition.
There is precious little information in this listing, but the seller claims this is a totally restored example, and it looks the part. It may end up sitting pretty in someone's collection, but it really needs to be gotten dirty first.
You can find this Bultaco (VIN: 203698745) for sale on here on Craigslist. Not sure where the bike is located - somewhere around Atlanta, and the seller is asking $5800.